100=-12.5b

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Solution for 100=-12.5b equation: 



100=-12.5b

We move all terms to the left:

100-(-12.5b)=0

We get rid of parentheses

12.5b+100=0

We move all terms containing b to the left, all other terms to the right

12.5b=-100

b=-100/12.5

b=-8

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